Issue 1413 plotting

[valentinsulzer]

Description

Introduces more customizability for QuickPlot and style, and an example for how to change the plotting style

Fixes #1413

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Merging #1419 (36f9c09) into develop (e1c51a2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1419   +/-   ##
========================================
  Coverage    98.27%   98.27%           
========================================
  Files          278      279    +1     
  Lines        16109    16147   +38     
========================================
+ Hits         15831    15869   +38     
  Misses         278      278           

Impacted Files	Coverage Δ
pybamm/plotting/plot.py	100.00% <ø> (ø)
pybamm/plotting/plot2D.py	100.00% <ø> (ø)
pybamm/__init__.py	94.95% <100.00%> (+0.17%)	⬆️
pybamm/plotting/plot_voltage_components.py	100.00% <100.00%> (ø)
pybamm/plotting/quick_plot.py	100.00% <100.00%> (ø)
pybamm/settings.py	100.00% <100.00%> (ø)

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[brosaplanella]

Looks good, thanks Tino! Happy to merge once coverage passes.